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benpicco merged 1 commit into from
Sep 11, 2019
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doc/mega-xplained: add JTAG/Atmel-ICE instructions #11209

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39 changes: 30 additions & 9 deletions boards/mega-xplained/doc.txt
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Expand Up @@ -10,28 +10,49 @@ is an evaluation kit by Atmel (now Microchip) for their ATmega1284P microcontrol

### Flash the board

1. The board may be flashed through JTAG or using a SPI ISP programmer. If
the Buspirate is being used, then `make flash` can be used to flash the
board:
```
make BOARD=mega-xplained -C examples/hello-world flash
```
You can change the fuses and flash the board using an SPI ISP programmer such
as the Bus Pirate, or using a JTAG programmer such as the Atmel-ICE with a
JTAG adapter.

If using the Atmel-ICE as a JTAG programmer, connect the adapter with the
square pin on the adapter connecting with the square pin on the board.

1. First, make sure the default fuse settings are correct.<br/>

WARNING: setting the fuses incorrectly can brick your board!

2. The default fuse settings must also be changed.<br/>
If using the Buspirate:
```
avrdude -p m1284p -c buspirate -P /dev/ttyUSB0 -U efuse:w:0xFF:m
avrdude -p m1284p -c buspirate -P /dev/ttyUSB0 -U hfuse:w:0x99:m
avrdude -p m1284p -c buspirate -P /dev/ttyUSB0 -U lfuse:w:0xE2:m
```
WARNING: setting the fuses incorrectly can brick your board!

If using the Atmel-ICE:
```
avrdude -p m1284p -c atmelice -U efuse:w:0xFF:m
avrdude -p m1284p -c atmelice -U hfuse:w:0x99:m
avrdude -p m1284p -c atmelice -U lfuse:w:0xE2:m
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```

2. After the fuses are set, flash the application.

If using the Buspirate:
```
BOARD=mega-xplained make -C examples/hello-world flash
```

If using the Atmel-ICE:
```
BOARD=mega-xplained PROGRAMMER=atmelice make -C examples/hello-world flash
```

### Accessing STDIO via UART

STDIO can be accessed through the USB connector. The on-board UART-USB
adapter is not affected by flashing. It shows up as /dev/ttyACM0 on Linux.
It will be used automatically with `make term`:
```
make BOARD=mega-xplained -C examples/hello-world term
BOARD=mega-xplained make -C examples/hello-world term
```
*/